My boyfriend and I have been trying have a baby and he came in me several times?

Its rly rare to get ur period whilst ur pregnant .. ive only heard of one other case like that.
if the pregnancy test says its negative and uve done a few of those consistently throughout a few months then ita more than likely you are not conceiving.
Ita best to get it checked out with a doctor though cause maybe ur hormone levels need to be noosted. Well im mot a doctor but u should check it out woth one just in case